<!-- arbitrary angles, transparency -->
<!-- max_color_diff with chrome is 2 -->
<!-- from https://developer.mozilla.org/en-US/docs/Web/CSS/gradient/linear-gradient -->
<!doctype html>
<style>
body,p {margin:0}
p {
	width: 150px;
	height: 100px;
	background: linear-gradient(217deg, rgba(255,0,0,.8), rgba(255,0,0,0) 70.71%),
				linear-gradient(127deg, rgba(0,255,0,.8), rgba(0,255,0,0) 70.71%),
				linear-gradient(336deg, rgba(0,0,255,.8), rgba(0,0,255,0) 70.71%);
}
</style>
<p>